https://blog.wongcw.com/2018/10/30/mac%e5%b0%8f%e6%8a%80%e5%b7%a7%ef%bc%8dmac%e9%a1%af%e7%a4%ba%e5%a4%9a%e8%b3%87%e6%96%99%e5%a4%be%e7%9a%84%e7%b8%bd%e5%ae%b9%e9%87%8f%e5%a4%a7%e5%b0%8f/
MAC小技巧-MAC顯示多資料夾的總容量大小